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- In industrial computer vision systems, the image quality is dependent on the parameters such as light source, illumination method, optics, and surface properties. Most of them are related with the lighting system, which is designed in heuristic based on the designer's experimental knowledge. In this paper, a design code by which the optimal lighting method and light source for computer vision systems can be found are suggested based on experimental results. The design code is applied to the design of the lighting system for the transistor marking inspection system, and the overall perfermance of the machine vision system with the lighting system shows the effectiveness of the proposed design code.